Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
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At the service entrance you will need AWG 1/0 gauge.
As a service entrance wire you need AWG # 3/0 gauge copper.
Service entrance wire should be AWG #3 copper.
I would recommend you use 1/0 gauge
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.